How long will it be with the mounts in cm?

Hi,Thanks for your inquiry,It about 107cm.

Hey can you tell me what light bar is brighter between the 42" curved osram or the 42" curved Cree 5D

Hi. 42" curved osram is brighter than 42" curved cree 5d

without the brackets, how long is it from mount to mount?

Hello, the distance from mount to mount is about 107cm.

How tall/deep is the housing?

Hello, thank you for your question. The depth(width) is about 3.54" and the height is about 3.15".